Question

我正在尝试升级数据库版本，在上一版本中，该表在迁移室上创建了唯一索引，这给了我以下错误

预期：

TableInfo{name='ALERT_STATUS', columns={resolution_time=Column{name='resolution_time', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0}, status=Column{name='status', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0}, id=Column{name='id', type='INTEGER', affinity='3', notNull=false, primaryKeyPosition=1}, event_time=Column{name='event_time', type='TEXT', affinity='2', notNull=true, primaryKeyPosition=0}, is_uploaded=Column{name='is_uploaded', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0}, InvErrorCode=Column{name='InvErrorCode', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0}, is_fault=Column{name='is_fault', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0}, FaultDetails=Column{name='FaultDetails', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0}, code=Column{name='code', type='TEXT', affinity='2', notNull=true, primaryKeyPosition=0}, component=Column{name='component', type='INTEGER', affinity='3', notNull=false, primaryKeyPosition=0}}, foreignKeys=[], indices=[Index{name='index_ALERT_STATUS_code_event_time', unique=true, columns=[code, event_time]}]}

发现：

TableInfo{name='ALERT_STATUS', columns={resolution_time=Column{name='resolution_time', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0}, status=Column{name='status', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0}, id=Column{name='id', type='INTEGER', affinity='3', notNull=false, primaryKeyPosition=1}, event_time=Column{name='event_time', type='TEXT', affinity='2', notNull=true, primaryKeyPosition=0}, is_uploaded=Column{name='is_uploaded', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0}, InvErrorCode=Column{name='InvErrorCode', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0}, is_fault=Column{name='is_fault', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0}, FaultDetails=Column{name='FaultDetails', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0}, code=Column{name='code', type='TEXT', affinity='2', notNull=true, primaryKeyPosition=0}, component=Column{name='component', type='INTEGER', affinity='3', notNull=false, primaryKeyPosition=0}}, foreignKeys=[], indices=[Index{name='code_time', unique=true, columns=[code, event_time]}]}

我尝试删除唯一索引，并且迁移工作正常，但是使用唯一索引却从未通过

我的数据库实体在下面

    @Entity(tableName = "ALERT_STATUS" , indices = {@Index(value = {"code", "event_time"},
    unique = true)})

  public class AlertStatus implements Serializable{
    @PrimaryKey(autoGenerate = true)
    public Integer id;

    @NonNull
    public String event_time;
    public String resolution_time;

    @NonNull
    public String code;
    public Integer component;
    public int status;
    public int is_fault;
    public String FaultDetails;
    public String InvErrorCode;
    public int is_uploaded;



    }

Answer 1

尝试一下对我有用。

创建一个新表，即Holder表，该表将在结构更改之间保存您的数据。

database.execSQL("CREATE TABLE TABLE_NAME (id INTEGER, column2 varchar(25) , PRIMARY KEY(id))");

根据需要创建唯一索引

database.execSQL("CREATE UNIQUE INDEX IF NOT EXISTS index name ON ALERT_STATUS1 (column1,column2)");

具有唯一索引的会议室数据库迁移问题

1 个答案: